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  • Help me with this Stack overflow Freak Show.I am asking a simple question on Stack overflow and once again, the closed minded morons a pointing and tutting. I'm asking a question about C point…

    ... operator to both get a value from a pointer, and to ...
    Scottie_uk Scottie_uk January 2014 Chit chat
  • Luca Bordoni Lost Treasures....For some reason today I came across Luca Bordoni's name. That ringed a bell so went and checked it out. Luca was the author of one of the most ambiti…

    ... nice with tons of nostalgic value.
    Misguide the nasty eskimos ...
    gabriele amore gabriele amore January 2014 Announcements
  • What to do when INT doesn't work?Due to the limitations of the Spectrum's floating point number format, two slightly different large numbers, or two slightly different small fraction…

    ... with the same 5-byte value. Alternatively, the result of a ...
    Battle Bunny Battle Bunny January 2014 Sinclair Basic
  • Refactoring the ULAplus HDL descriptionFor the ZXUnio project, I'm refactoring the Verilog code I wrote two years ago to describe the ULA and the ULAplus devices. When I've taken this code…

    ... working frequency fown to this value allows me to have combinational ...
    mcleod_ideafix mcleod_ideafix February 2014 Hardware
  • Morcar's Selling or trading threadThinning out my collection so i can get more of what i want. If you want anything on here let me know and we can work out something. I am also up f…

    ... /> Barbarian (Psygnosis)
    Beau-Jolly Value Pack (Cosmic Cruiser, B.C ...
    morcar morcar February 2014 Sales
  • Port $28FF. Why 28?Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putt…

    Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putting the value $28 in A15-A8 during a read to $FF?

    Thank you very much in advance! :)
    mcleod_ideafix mcleod_ideafix February 2014 Hardware
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    When using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store it?
    MatGubbins MatGubbins March 2014 Development
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    ... hl,de ;hl = address of attr on screen
    ld a ... b=X, hl=attrs, sp=attr row table
    REPT 8 ...
    joefish joefish March 2014 Development
  • Does this addressing technique have a name?Hi All, Bit of a weird/unnecessary question, but can anyone help build on my knowledge of asm terminology by telling me what the *second* method of …

    ... (PlyrX) gets loaded it's value without any actual mention in ...
    Jagd Tiger Jagd Tiger March 2014 Development
  • Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …

    ... significant bits to leave a value of 0, 64 or 128 ... another ? we take this masked value and divide it by 8 ... to give us a value of 0, 8 or 16 ...
    Jagd Tiger Jagd Tiger April 2014 Development
  • SBC IX,DE/BCAlways wondered why there wasn't a SBC IX, DE/BC command.... so have to use PUSH HL ; save original HL PUSH IX ; IX on stack POP HL ; IX …

    ... stack
    POP HL ; IX value off stack into HL
    PUSH HL ; calc'd value on stack
    POP IX ... same time, DE is the value to subtract, BC is the ...
    MatGubbins MatGubbins April 2014 Development
  • understanding machine codeHi Quick question. Am not really sure if it fits development forum as its not really development per se its more a learners question about developm…

    ... which is A's current value after its executed and I ...
    username username April 2014 Sinclair Miscellaneous
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... br /> ld a, 3 ;Counter value
    ld (cfield),a ;Set ... br /> ld a,64 ;Ref value
    ld (dreg),a ; ... Set dreg value for field location
    mloop ... br /> ld a,8 ;Counter value
    ld (cslice),a ;Set ...
    LuMan LuMan April 2014 Development
  • SBC or ADDIs this dangerous/bad practice thing to do..... I want to subtract 64 from a number, but to save a few bytes can I just add (65536-64) 65472 to the…

    ... routines give the same correct value of 32704.

    Also ... feed BC with the correct value and add.

    Sometimes ...
    MatGubbins MatGubbins April 2014 Development
  • Column and row numbers to attr address?[FONT=Calibri][SIZE=3]Can anyone provide me with a code snippet the will convert the column and row numbers into the screen attribute address. For ex…

    [FONT=Calibri][SIZE=3]Can anyone provide me with a code snippet the will convert the column and row numbers into the screen attribute address. For example, if de = 0 then the output should be 22528. If de = 256 (column = 1 and row = 0) then the output ...
    Mr Millside Mr Millside April 2014 Development
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... devices would receive the written value.

    Curiously the kludge ...
    rga24 rga24 May 2014 Hardware
  • OUTLAST on PS4I have just completed OUTLAST on the PS4. It is without doubt the scariest game I have ever played. The sheer feeling of dread and terror whilst wa…

    ... regards to jumps and shock value, combined with some of the ...
    stupidget stupidget May 2014 Chit chat
  • Currah microspeech emulationI am implementing Currah Microspeech in FBZX Wii. I based the emulation on the information taken from: [url]http://nocash.emubase.de/zxdocs.htm[/ur…

    ... set of allophones with the value lenght which should be correct ...
    Oibaf Oibaf May 2014 Emulators
  • Selling misc Spectrum bits + old contractsHi, I've got a few bits and pieces of old spectrum stuff that I'd like to sell.. I don't know terribly much about it as it came to me rather than me …

    ... whether that's of any value to collectors?

    [IMG ...
    sellingstuff sellingstuff May 2014 Sales
  • Fuse bug? Strange T state countingI was testing delay routine presented [URL="http://www.worldofspectrum.org/forums/showthread.php?p=214851"]here[/URL]. I'm reproducing its listing: …

    ... 's stated that the minimum value for delay is 141 T ... of 148 T, instead expected value o f 141 T. :confused ...
    TK90XFan TK90XFan May 2014 Emulators
  • Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …

    ... object info.

    The ATTR function works well for getting ... /> Is there any reverse of ATTR, allowing me to apply attributes ...
    Dock Dock June 2014 Sinclair Basic
  • Dock's ZX Maze gameI'm hoping to finish a simple maze game in ZX Spectrum BASIC this week, as part of the Ludumdare Retro challenge. I used to dabble in speccy basic on…

    ... collides with tiles with the ATTR read of 112, but I ...
    Dock Dock June 2014 Sinclair Basic
  • CRONOSOFT "SHAPESHIFTER" COMPETITION -You may or may not have seen the post in the other section about the forthcoming new game "ShapeShifter" by Ian Munro, but anyhow.... just like the o…

    ... 1p, whichever is the higher value at the time of judging)
    chaosmongers chaosmongers June 2014 Games
  • Xbox OneI'm seriously considering picking up an Xbox One, possibly this weekend, but that all depends on what money I have and the mood I'm in to be honest! …

    ... there seem to be better value bundles for the full set ...
    Bermondsey Bob Bermondsey Bob June 2014 Chit chat
  • Repton ManiaHi all, I am the creator, and look after, the Repton Resource Page ([url]www.reptonresourcepage.co.uk[/url]). For the site, I have written a freely …

    ...

    Machine Types
    Value Machine
    0 48K
    geraldholdsworth geraldholdsworth June 2014 Games
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... JR Z,test)_2 ; bad value (zero value)
    0x11EC DEC (HL ... /> 0x11ED JR Z,uploop ; correct value!
    test_2:
    0x11EF DEC ...
    tstih tstih July 2014 Development
  • Manic Miner loading screen adjustmentHad half an hour spare earlier and wanted to try a few things. Always like to learn anyways even now. [URL="http://www.yellowspider.co.uk/speccy/Man…

    ... of it is still just attr's lol) :)

    Do ...
    spider spider July 2014 Games
  • analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …

    ... $2900 V_EACH with the correct value for (VARS) in HL. The ...
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Problem Reading the KeyboardHi Folks, I'm working my way through Toni Baker's rather good book and thought I'd write some code to scan the keyboard and store the results so tha…

    ... ,0x00

    _keyboardSegments ;the value of the 8 keyboard segments ...
    KrazyKattapilla KrazyKattapilla July 2014 Development
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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